Phosphate

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PROBLEM TO BE SOLVED : To provide a rare earth phosphate hardly causing the lowering of initial brightness, the lowering of brightness maintaining rate when continuously lit, and temperature quenching, and capable of easily controlling its particle diameter, a rare earth phosphate fluorescent material, and their manufacturing method. SOLUTION : This rare earth phosphate is represented by the composition formula : LnxCeyTbzPO4(wherein Ln represents at least an element selected from the group consisting of La, Gd and Y; x, y and z are each a number satisfying the conditions : 0≤xCOPYRIGHT : (C)2009, JPO&INPIT